A mechanism of transport of nonspherical particles in a shearing gas
It is well known that small particles in a gas are transported relative to the gas when there is a temperature gradient. This phenomenon is called thermoporesis or thermal diffusion. The transport is in the direction opposite to that of the temperature gradient. It was used in the separation of uranium isotopes. A related phenomenon, named shearing phoresis, has been discovered. It is a transport which occurs when the gas is shearing. Interestingly, there is no transport of spherical particles. The mechanism has been derived in the free molecular flow limit.